Final Answer:
javascript
document.write("Hello World!<br>");
document.write("Hello Canada!<br>");
document.write("Hello Ontario!<br>");
document.write("Hello Sheridan.");
Step-by-step explanation:
In JavaScript with HTML DOM, the provided code utilizes the `document.write` method to display four lines of text. Each line contains a greeting message: "Hello World!," "Hello Canada!," "Hello Ontario!," and "Hello Sheridan."
The `document.write` method is commonly used to output content directly to the HTML document. In this case, it sequentially writes each greeting message to the document. The `<br>` tag is used to insert line breaks, ensuring that each greeting appears on a new line.
This code snippet is straightforward and demonstrates a basic use of JavaScript for dynamically generating content within an HTML document. It's a simple way to showcase how JavaScript can be employed to manipulate the Document Object Model (DOM) and dynamically alter the content displayed on a webpage. Each `document.write` statement adds a new line to the document, resulting in the four greetings being displayed in a vertical list.